Antenna dimensions required

sir,
I need to design a printed antenna on fr-4 substrate which operates at TV band 450MHz , GSM 900MHz,1800MHz.
please suggest me specifications and type of antenna.

Are you looking for a triband planar antenna for all those services?

DavidZlavan said:

Are you looking for a triband planar antenna for all those services?

Click to expand...

Because GSM antennas are usually made of porcelain patches like these ones **broken link removed**

And for TV are usually made yagui kind. Very directive and big. Like these ones https://www.amazon.com/HDTV-Fringe-Outdoor-Television-Antenna/dp/B00DHHQSB8

Luckily for you I have a interior TV antenna and I have taken a couple of photos. The wired one is for DAB service and the printed one (the triangles) is for TV service.

https://mega.nz/#!nVsD1Ayb!4iUuMfFitunj-nm2PtCs817kq-NPvgFRf1SLSdKRYss

https://mega.nz/#!LMUlHKBA!28xL4zUHbU0HanM1CaqMRhVRipDPFbTuGdoWn_4Crn4

Hope that helps

BR,

DavidZlavan said:

Because GSM antennas are usually made of porcelain patches like these ones **broken link removed**

And for TV are usually made yagui kind. Very directive and big. Like these ones https://www.amazon.com/HDTV-Fringe-Outdoor-Television-Antenna/dp/B00DHHQSB8

Luckily for you I have a interior TV antenna and I have taken a couple of photos. The wired one is for DAB service and the printed one (the triangles) is for TV service.

https://mega.nz/#!nVsD1Ayb!4iUuMfFitunj-nm2PtCs817kq-NPvgFRf1SLSdKRYss

https://mega.nz/#!LMUlHKBA!28xL4zUHbU0HanM1CaqMRhVRipDPFbTuGdoWn_4Crn4

Hope that helps

BR,

Click to expand...

Thank you sir for your reply,
Can you please suggest me shape of the patch i have to take to achieve all 3 bands.

All three bands is not really possible, because the physical dimensions determine the operating frequency.
Whatever you decide to make can only have one physical size.

Three widely separated bands require three separate antennas.

Thank you, Can you please suggest the shape and dimensions of patch for TV Band(450-550 MHz) printed antenna

if iam not wrong, we can use inverted f antenna for gsm band i guess ?

kumarmcc08 said:

Thank you, Can you please suggest the shape and dimensions of patch for TV Band(450-550 MHz) printed antenna

Click to expand...

Dimensions are usually given by lambda/4. There are several techniques and several antenna designs to reduce dimensions etc. But anyway TV frecuencies are lower (450-550) than GSM ones so maybe you can implement a TV antenna like the one I showed you in the photos and in the same PCB implement a duplexer and the GSM antenna.

https://www.wavelengthcalculator.com/ this will help you with an approximate value but have in mind that lambda is dependent from the substrate you are using for the PCB.

BR,

- - - Updated - - -

kumarmcc08 said:

Thank you, Can you please suggest the shape and dimensions of patch for TV Band(450-550 MHz) printed antenna

Click to expand...

Dimensions are usually given by lambda/4. There are several techniques and several antenna designs to reduce dimensions etc. But anyway TV frecuencies are lower (450-550) than GSM ones so maybe you can implement a TV antenna like the one I showed you in the photos and in the same PCB implement a duplexer and the GSM antenna.

https://www.wavelengthcalculator.com/ this will help you with an approximate value but have in mind that lambda is dependent from the substrate you are using for the PCB.

BR,